Men in Black: International

In Brooklyn in 1996, Molly Wright witnesses her parents being neuralysed by agents of Men in Black (MiB) while she helps an alien escape, avoiding neuralysation herself as her parents assumed that she was asleep.
Twenty-three years later, having been rejected in applications to the FBI and the CIA on the grounds of her "delusions" regarding the evidence of alien life, she manages to track down an alien landing and track the MiB agents back to MiB headquarters in New York. Although she is caught upon entering the agency, Molly makes an impression on Agent O, arguing that she has proven her skills in finding out about the organization's existence and has no life outside of her search for the agency. Convinced, she is awarded probationary agent status as "Agent M" and assigned to the London branch of the organization.